Definitions
1.nounSomething that is number two in a series.
2.nounSomething that is next in rank, quality, precedence, position, status, or authority.
3.nounThe place that is next below or after first in a race or contest.
4.noun(usually in the plural) A manufactured item that, though still usable, fails to meet quality control standards."They were discounted because they contained blemishes, nicks or were otherwise factory seconds."
5.noun(usually in the plural) An additional helping of food."That was good barbecue. I hope I can get seconds."
6.nounA chance or attempt to achieve what should have been done the first time, usually indicating success this time around. (See second-guess.)
7.nounThe interval between two adjacent notes in a diatonic scale (either or both of them may be raised or lowered from the basic scale via any type of accidental).
8.nounThe second gear of an engine.
9.nounSecond base.
10.nounThe agent of a party to an honour dispute whose role was to try to resolve the dispute or to make the necessary arrangements for a duel.
11.nounA Cub Scout appointed to assist the sixer.
12.verbTo agree as a second person to (a proposal), usually to reach a necessary quorum of two. (See under #Etymology 3 for translations.)"I second the motion."
13.verbTo follow in the next place; to succeed.
14.verbTo climb after a lead climber.
15.adjectiveNumber-two; following after the first one with nothing between them. The ordinal number corresponding to the cardinal number two."He lives on Second Street."
16.adjectiveNext to the first in value, power, excellence, dignity, or rank; secondary; subordinate; inferior.
17.adjectiveBeing of the same kind as one that has preceded; another."Residents of Texas prepared for Hurricane Harvey, which would in some ways turn out to become the second Hurricane Katrina."
18.adverb(with superlative) After the first; at the second rank."Saturn is the second largest planet."
19.adverbAfter the first occurrence but before the third."He is batting second today."